Written by Jennifer Walsh. Reviewed for technical accuracy by Shubham Dixit, Independent Expert in Email Forensics and Data File Conversion.
Shubham is an independent external reviewer and not an employee of PCDOTS.
Quick answer. A BMP is an uncompressed bitmap image and a PDF is a document, so converting BMP to PDF places the picture onto a PDF page. On Windows you can do it free with Microsoft Print to PDF, and selecting several BMP files at once turns them into one PDF. Mac uses Preview, and a tool handles big batches.
On this page
Bitmap image, PDF document
Quick bit of background, because it explains why this is so easy. A BMP is a bitmap, a plain grid of pixels stored with little or no compression, which is why BMP files tend to be large. A PDF is a portable document, a page format that displays the same on any device. So converting BMP to PDF is not really a deep transformation, you are placing the image onto a PDF page and saving that page as a document. No, a BMP and a PDF are not the same thing, one is a raw picture and the other a document wrapper, but putting the first inside the second takes seconds, and on Windows you already have the tool for it.
Converting simply lays the bitmap onto a PDF page.
“There is a common worry that converting an image loses quality, but going from BMP to PDF does not resample the picture, it wraps the same pixels in a page, so what you see is what you had. The thing to keep an eye on is size, a BMP is uncompressed to begin with, so a PDF built straight from several of them can get heavy. If that matters, convert with a tool that compresses the images as it builds the page. And when you have more than a handful, do them in one batch rather than one file at a time, it is the same result with far less clicking.” Shubham Dixit, Data File Conversion reviewer (draft, pending approval)
The free Windows way, one file
Windows 10 and 11 include a built-in Microsoft Print to PDF, so you need nothing extra. Open your BMP in the Photos app or Paint, press Ctrl and P or choose Print, then in the printer list pick Microsoft Print to PDF. Click Print, give the file a name, choose where to save it, and you have a PDF. That is the whole thing for a single image, no install, no upload, and it works the same on any recent Windows version.
Microsoft Print to PDF is built into Windows, no download needed.
Several BMP files into one PDF, free
Here is the part most guides miss, and it is free too. If you have several BMP images and want them in one PDF, you do not need paid software, Windows does it from File Explorer. Select all the BMP files, right-click, choose Print, and in the print window set the printer to Microsoft Print to PDF. Pick a layout on the right, full page or contact-sheet style, then Print, and Windows combines every selected image into a single PDF, one image per page. It is the quickest free answer for turning a folder of bitmaps into one document.
On a Mac, use Preview
No Windows? A Mac does this natively too. Open the BMP in Preview, then choose File and Export as PDF, pick a location, and save. For several images, select them together in Finder, open them in one Preview window, and either export or use Print then the PDF menu, Save as PDF, to get them all in one file. Same idea as Windows, same result, no extra software.
For a big batch, the power routes
Comfortable with a command line and moving a lot of files? Two free options are hard to beat. ImageMagick turns a whole folder into one PDF in a single line, magick *.bmp output.pdf, and it is free and cross-platform. Or a few lines of Python with the Pillow library will open your BMP files and save them as a multi-page PDF, handy if you want to script it into a larger job. Both are overkill for one or two images, but excellent when you are converting hundreds.
A tool for bulk with control
If you would rather not touch a command line but still want to convert many files at once with options, that is where a dedicated tool fits. The PCDOTS Image Converter loads BMP files or whole folders, previews them, and exports to PDF, letting you combine everything into one document or keep them separate, all offline on your computer. It runs on Windows across current and older versions, with a trial you can test first. For a single image the built-in Print to PDF above is genuinely all you need, this is for volume and the extra control.
The tool route, many BMP files into PDF in one pass.
Here are the tool steps with the screens.
Step 1. Install and run the converter on Windows.
Step 2. Add your BMP files or a whole folder.
Step 3. Open Export and choose PDF, combined or separate.
Step 4. Pick a destination and save.
Related reading, our guides to convert BMP to TIFF, convert BMP to PSD and convert PNG to GIF.
The methods compared
All of these give you a PDF, so pick by how many files you have and what you are on.
| Method | Best for | Good to know |
|---|---|---|
| Microsoft Print to PDF | One or a few, on Windows | Free, built in |
| Explorer, right-click Print | Several into one PDF | Free, one per page |
| Mac Preview | Mac users | Free, Export as PDF |
| Converter tool | Big batches with options | Windows, offline |
Frequently asked questions
How do I convert a BMP to PDF for free on Windows?
Open the BMP in Photos or Paint, press Ctrl and P, choose Microsoft Print to PDF as the printer, then save. It is built into Windows 10 and 11.
How do I convert multiple BMP files into one PDF?
In File Explorer, select the BMP files, right-click, choose Print, set the printer to Microsoft Print to PDF, pick a layout, and Windows saves them as one PDF.
How do I convert a BMP to PDF on a Mac?
Open the image in Preview, choose File then Export as PDF, and save. For several, open them together in Preview and export or print to PDF.
Is a BMP file the same as a PDF?
No. A BMP is a raw bitmap image, a grid of pixels, while a PDF is a document. Converting places the image onto a PDF page.
Will converting reduce the image quality?
No. The pixels are wrapped into the page as they are. BMP files are large, though, so a PDF made from several can be sizeable unless the tool compresses them.
Are online BMP to PDF converters safe?
They work, but they upload your images to someone else’s server. For anything private, the built-in Windows or Mac methods keep the files on your own computer.
The one thing worth remembering
If you take away a single point, let it be this, on Windows you already have everything you need. Microsoft Print to PDF is built in, it turns a BMP into a PDF in a few clicks, and by selecting several files in File Explorer and printing them together it even combines them into one document, all without installing or uploading a thing. Reach for a converter only when you are handling big batches and want the extra layout control, but for the everyday job, the answer was on your PC the whole time.
